Lu Cheng, a new criminal police officer in the serious crime team, possesses the incredible ability of photographic memory, and follows his master Lao Han into the extremely dangerous battlefield of criminal investigation.
Secret rooms, unsolved cases, underworld, cross-border crimes, criminal organizations have been dormant for many years, hidden lines are spread all over the country, small cases lead to shocking conspiracies, and old cases hide transnational puzzles.
He captured all the clues at the crime scene and the hidden loopholes in the old files. The master and apprentice join forces, using memory as the blade and logic as the sword, to tear through the layers of fog and locate the traces of the real murderer.
